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Department of Mathematics and Science
Grade 3 Quarter 2
Big Idea 10: Forms of Energy Light and Its Properties
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Department of Mathematics and Science
Big Idea 10: Forms of Energy Light and Its Properties
Grade 3 Benchmarks
• SC.3.P.10.3 - Demonstrate that light travels in a straight line until it strikes an object or travels from one medium to another.
• SC.3.P.10.4 - Demonstrate that light can be reflected, refracted, and absorbed.• SC.3.P.11.1 - Investigate, observe, and explain that things that give off light often
also give off heat.• SC.3.P.11.2 - Investigate, observe, and explain that heat is produced when one
object rubs against another, such as rubbing one's hands together.• SC.3.E.6.1 - Demonstrate that radiant energy from the sun can heat objects and
when the sun is not present, heat may be lost.
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Department of Mathematics and Science
Discovery Light Resources
•Exploration: Light Energy• Reading Passage: Seeing in the Dark• Video: Light: A Visible Form of Energy•Exploration: Reflection•Video: Light Reflection: Dependent on Surface• Video: Light Sources and ObservationsExploration: Refraction•Video: Refraction•Video: The Visible Spectrum
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Department of Mathematics and Science
Supplemental Light Resources
AIMS Gr. 3 Physical Science:• Energy Match-up p. 151• Light Essentials p. 175• Light Rays Slow Down p. 205• Just Passing Through p. 183
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Department of Mathematics and Science
What is light?What is light?
• Light is something that allows us to see objects.• Light is a form of energy. • Light is produced by the vibrations of electrically
charged particles.
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Department of Mathematics and Science
Where Does Light Come From?
Sources of Light
SunCeiling LightsLight bulbs/lampsFlashlight
Candle flame
Produced By
Nuclear reactionsElectricityElectricityChemical reactions &ElectricityChemical energy
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Department of Mathematics and Science
What do we know about the Properties of Light?
• Light travels in a straight path.• Light doesn’t travel through all objects. These are defined as opaque.• Light can be absorbed and changed to heat.
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Department of Mathematics and Science
What else do we know about Light?
• Light bounces off or is reflected from some kinds of opaque objects.
• Light travels in waves.
Angles of Reflection
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Department of Mathematics and Science
Compare and Contrast ActivityWrite down your responses in your science notebook.
Cardboard VS A Mirror
• Light doesn’t pass through – opaque• dull• A little roughWhat happens when light strikes it? Cardboard absorbs light.
• Light doesn’t pass through – opaque• shiny• very smoothWhat happens when light
strikes it? A mirror reflects light.
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Department of Mathematics and Science
Just Passing Through Activity
Write down your responses in your science notebook.
1.What are objects classified as that let all light pass through? Example: glass window; glass cup transparent 2.What are some other transparent examples?3.What are objects classified as that let some light pass through? Examples: wax paper; stained glass window translucent4. What are some other translucent examples?
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Department of Mathematics and Science
Bending Light LabWrite down your responses in your science notebook.
• Problem: What does light do when it travels from one medium or state of matter (air) through another medium (water)?
• Hypothesis: • Test and Observe: Follow steps from the lab sheet.• Conclusion:
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Department of Mathematics and Science
How does Light Changes Direction?
Explore the Refraction of Light Virtual TutorialAnswer:Light bends or refracts as it passes from one medium (form of matter: solid, liquid or gas) to another.
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Department of Mathematics and Science
What Color is Light?Write down responses in your notebook.
• Problem: What happens when we shine a flashlight on a CD?
• Hypothesis:• Test and Observe: • Conclusion:
• Explain/Extend: How a Prism Works
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Department of Mathematics and Science
More on Bending LightExplore the Gr. 3 Quarter 2 Light Color LabEvaluate:Write a conclusion using the CER: Claim Evidence Reasoning Conclusion.Question: What colors make up white light?Claim: Evidence: Reasoning:
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Department of Mathematics and Science
Claim Evidence Reasoning CER Sample Answer
Question: What colors make up white light?Claim: White light includes all the colors of the rainbow - ROY G BIV.
Evidence: The rainbow colors observed when the light from the window
or flashlight passed through the bubble. Reasoning: When light passes from the air, a gas, to the bubble, a liquid, it
bends.
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Department of Mathematics and Science
TAG Reflections
• Tell a fact you learned about light.• Ask a question about something you don’t
understand about light.• Give another idea that was addressed in our
study of energy.